TOpic 32: Clade Reptiles Flashcards
characteristics of non-avian reptiles
- skin protection and shedding
- eggs in leathery shells
- 3 chambered heart
- ectothermic
skin production and shedding in reptiles
non avian reptiles skin barrier is protected by thick, dry, keratinous scales creating a waterproof barrier (highly resistant to dessication)
oviparous
animals who bury their shelled eggs onland
two primary lineages of diapsids
- lepidosaurs
- archosaur
first tetrapods with adapted flight
- pterosaurs
animals with
- box-like bony or cartilagous shell made of dorsal and ventral shields that are fused to the vertebrae, calvicles, and ribs
- toothless beaks
- single intomittent organ
turtles and tortoises
reptile clade with
- teeth fused to the jaw
- overlapping scales
- hemipenis (paired penis) à
lepidosaurs
two groups under lepidosaurs
tuataras and squamates
characteristics of tuataras
- lack modified jaw structure
- no intromitted organ
- internal fertilization but they still have a hemipenis
squamates characteristics
- loosely jointed jaws and skulls
- hemipenis
groups under squamates
- lizards and snakes
what are two things snakes lack, but lizards have?
- limbs
- external ears
snakes are bascially legless lizards, what did they evolve from
burrowing lizzards
most lizards and crocodiles do not ____
chew
archosaurs
- lizards with socketed teeth and arent fused to the jawch